linux-kernel - Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board installed, unless RAM size limited to 3500M

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Date:   Wed, 27 Nov 2019 16:14:43 +0100
From:   Christian Zigotzky <chzigotzky@...osoft.de>
To:     Mike Rapoport <rppt@...ux.ibm.com>, Christoph Hellwig <hch@....de>
Cc:     Robin Murphy <robin.murphy@....com>, linux-arch@...r.kernel.org,
        darren@...vens-zone.net, mad skateman <madskateman@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        iommu@...ts.linux-foundation.org, Rob Herring <robh+dt@...nel.org>,
        paulus@...ba.org, rtd2@...a.co.nz,
        "contact@...on.com" <contact@...on.com>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        nsaenzjulienne@...e.de
Subject: Re: Bug 205201 - Booting halts if Dawicontrol DC-2976 UW SCSI board
 installed, unless RAM size limited to 3500M

On 27 November 2019 at 07:56 am, Mike Rapoport wrote:
>
> Maybe we'll simply force bottom up allocation before calling
> swiotlb_init()? Anyway, it's the last memblock allocation.
>
>
> diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
> index 62f74b1b33bd..771e6cf7e2b9 100644
> --- a/arch/powerpc/mm/mem.c
> +++ b/arch/powerpc/mm/mem.c
> @@ -286,14 +286,15 @@ void __init mem_init(void)
>   	/*
>   	 * book3s is limited to 16 page sizes due to encoding this in
>   	 * a 4-bit field for slices.
>   	 */
>   	BUILD_BUG_ON(MMU_PAGE_COUNT > 16);
>   
>   #ifdef CONFIG_SWIOTLB
> +	memblock_set_bottom_up(true);
>   	swiotlb_init(0);
>   #endif
>   
>   	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
>   	set_max_mapnr(max_pfn);
>   	memblock_free_all();
>   
>   
Hello Mike,

I tested the latest Git kernel with your new patch today. My PCI TV card 
works without any problems.

Thanks,
Christian